Removes some dead code and includes

mash/example/common/mus_views_init.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MASH_EXAMPLE_COMMON_MUS_VIEWS_INIT_H_
-#define MASH_EXAMPLE_COMMON_MUS_VIEWS_INIT_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "services/ui/public/cpp/window_tree_client_delegate.h"
-#include "services/ui/public/interfaces/window_manager.mojom.h"
-#include "ui/views/mus/aura_init.h"
-#include "ui/views/views_delegate.h"
-
-namespace service_manager {
-class ServiceContext;
-}
-
-namespace views {
-class AuraInit;
-}
-
-// Does the necessary setup to use mus, views and the example wm.
-class MUSViewsInit : public views::ViewsDelegate,
-                     public ui::WindowTreeClientDelegate {
- public:
-  explicit MUSViewsInit(service_manager::ServiceContext* app);
-  ~MUSViewsInit() override;
-
- private:
-  ui::Window* NewWindow();
-
-  // views::ViewsDelegate:
-  views::NativeWidget* CreateNativeWidget(
-      views::internal::NativeWidgetDelegate* delegate) override;
-  void OnBeforeWidgetInit(
-      views::Widget::InitParams* params,
-      views::internal::NativeWidgetDelegate* delegate) override;
-
-  // ui::WindowTreeClientDelegate:
-  void OnEmbed(ui::Window* root) override;
-  void OnDidDestroyClient(ui::WindowTreeClient* client) override;
-#if defined(OS_WIN)
-  HICON GetSmallWindowIcon() const override;
-#endif
-
-  service_manager::ServiceContext* app_;
-  std::unique_ptr<views::AuraInit> aura_init_;
-  ui::mojom::WindowManagerPtr window_manager_;
-
-  DISALLOW_COPY_AND_ASSIGN(MUSViewsInit);
-};
-
-#endif  // MASH_EXAMPLE_COMMON_MUS_VIEWS_INIT_H_